XO7050 OSCILLATOR EURO QUARTZ 32.768kHz Low Power AT-Cut Clock Oscillator FEATURES AT-Cut crystal for excellent temperature stability Low power consumption: 50µA typical at 15pF load Wide supply voltage: +1.8 V to 5.0 Volts Stability ±20ppm, 25ppm or ±30ppm Fast start-up time Miniature 7.0mm x 5.0mm package OUTLINE & DIMENSIONS DESCRIPTION XO7050 oscillators utilise AT-Cut crystals providing much improved, tight frequency stability as opposed to that stabiity provided by 32.768kHz oscillators using the more usual X-Cut (tuning fork) crystals. The tight control of frequency provided by these oscillators results in a typical variation of 52 seconds for one month of continuous operation as against 260 seconds over the same period for oscillators that use tuning fork crystals.Other benefits include low supply current consumption coupled with quick start-up times. SPECIFICATION Frequency: Frequency stability* Operating Temperature Range: Storage Temperature Range: Input Voltage: Input Current: Output Symmetry: Rise/Fall Times: Logic Low '0' Level (Vol): Logic High '1' Level (Voh): Output Load: Start-up Time: Ageing: Enable/Disable Delay Time*: 32.7680kHz ±20ppm, ±25ppm, ±30ppm (Overall conditions) -40° to +85°C -55° to +125°C +1.8 Volts to 5.0 Volts ±5% 80µA maximum (50µA typical) 45% to 55% at ½ Vdd level 6ns maximum (10% to 90%Vdd) 10% Vdd maximum 90% Vdd minimum CMOS 15pF maximum 1ms maximum ±3ppm max. at 25±3°C 1st year 100ns maximum INPUT CURRENT vs. VDD NOTE STABILITY OVER TEMPERATURE (High stability over -40° to +85°C for XO7050 AT-Cut Type) PART NUMBERS XO7050 oscillators part numbers are ordered as follows: 32.7680kHz XO7050 - 25 - B Frequency 32.768kHz Model Number XO7050 Stability in ppm 20, 25 or 30ppm Supply Voltage Blank = 5.0 Volts A = 3.3 Volts B = 2.5 Volts C = 1.8 Volts EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 [email protected] www.euroquartz.co.uk